crypto/external/bsd/openssl/dist/demos/smime/smsign.c

   1 /* Simple S/MIME signing example */
   2 #include <openssl/pem.h>
   3 #include <openssl/pkcs7.h>
   4 #include <openssl/err.h>
   5
   6 int main(int argc, char **argv)
   7         {
   8         BIO *in = NULL, *out = NULL, *tbio = NULL;
   9         X509 *scert = NULL;
  10         EVP_PKEY *skey = NULL;
  11         PKCS7 *p7 = NULL;
  12         int ret = 1;
  13
  14         /* For simple S/MIME signing use PKCS7_DETACHED.
  15          * On OpenSSL 0.9.9 only:
  16          * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM
  17          * for streaming non-detached set PKCS7_STREAM
  18          */
  19         int flags = PKCS7_DETACHED|PKCS7_STREAM;
  20
  21         OpenSSL_add_all_algorithms();
  22         ERR_load_crypto_strings();
  23
  24         /* Read in signer certificate and private key */
  25         tbio = BIO_new_file("signer.pem", "r");
  26
  27         if (!tbio)
  28                 goto err;
  29
  30         scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  31
  32         BIO_reset(tbio);
  33
  34         skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  35
  36         if (!scert || !skey)
  37                 goto err;
  38
  39         /* Open content being signed */
  40
  41         in = BIO_new_file("sign.txt", "r");
  42
  43         if (!in)
  44                 goto err;
  45
  46         /* Sign content */
  47         p7 = PKCS7_sign(scert, skey, NULL, in, flags);
  48
  49         if (!p7)
  50                 goto err;
  51
  52         out = BIO_new_file("smout.txt", "w");
  53         if (!out)
  54                 goto err;
  55
  56         if (!(flags & PKCS7_STREAM))
  57                 BIO_reset(in);
  58
  59         /* Write out S/MIME message */
  60         if (!SMIME_write_PKCS7(out, p7, in, flags))
  61                 goto err;
  62
  63         ret = 0;
  64
  65         err:
  66
  67         if (ret)
  68                 {
  69                 fprintf(stderr, "Error Signing Data\n");
  70                 ERR_print_errors_fp(stderr);
  71                 }
  72
  73         if (p7)
  74                 PKCS7_free(p7);
  75         if (scert)
  76                 X509_free(scert);
  77         if (skey)
  78                 EVP_PKEY_free(skey);
  79
  80         if (in)
  81                 BIO_free(in);
  82         if (out)
  83                 BIO_free(out);
  84         if (tbio)
  85                 BIO_free(tbio);
  86
  87         return ret;
  88
  89         }